Currently NO iPad can fully replace any full featured computer.
There are still many things iPads cannot do.
Limited input devices
Very basic, rudimetary external drive support
Limited multitasking features.
Limited file formats recognition/access.
Still no free access to ALL of the iOS/iPadOS file system/system files.
Can ONLY install apps from Apple's walled iOS App Store.
That is why I still own a Mac.
Apple has never, ever claimed that ANY iPad can replace any Mac or Windows PC.
iPads ARE a diffrent type of computer/computing devixe in tablet form.
iPads and iPadOS can do a lot more, now, than an iPhone.
That is why Apple split the two devices, now, with two different OS versions.
iPadOS is for larger screen iPads
iOS is for iPhones.